CVE-2000-0268

NONECVSS 0.0

0.0

Cisco IOS 11.x and 12.x allows remote attackers to cause a denial of service by sending the ENVIRON option to the Telnet daemon before it is ready to accept it, which causes the system to reboot.

CVSS v3: —
EG Score: —
EPSS: 73.2%
KEV: Not listed

Published

April 20, 2000

Last Modified

April 16, 2026

References (6)

cve@mitrehttp://www.cisco.com/warp/public/707/iostelnetopt-pub.shtml
cve@mitrehttp://www.osvdb.org/1289
cve@mitrehttp://www.securityfocus.com/bid/1123
af854a3a-2127-422b-91ae-364da2661108http://www.cisco.com/warp/public/707/iostelnetopt-pub.shtml
af854a3a-2127-422b-91ae-364da2661108http://www.osvdb.org/1289
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/1123

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-29 13:40 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-27 13:37 UTCepss_batch
2026-05-27 13:37 UTCepss_batch
2026-05-26 13:41 UTCepss_batch
2026-05-26 13:41 UTCepss_batch
2026-05-26 13:41 UTCepss_batch
2026-05-26 07:16 UTCepss_batch
2026-05-26 07:16 UTCepss_batch
2026-05-24 16:42 UTCepss_batch
2026-05-22 21:15 UTCepss_batch
2026-05-21 22:38 UTCepss_batch
2026-05-20 22:36 UTCepss_batch
2026-05-20 11:20 UTCepss_batch
2026-05-20 11:20 UTCepss_batch
2026-05-18 21:29 UTCepss_batch
2026-05-18 21:29 UTCepss_batch

Frequently asked(4)

What is CVE-2000-0268?

CVE-2000-0268 is a none vulnerability published on April 20, 2000. Cisco IOS 11.x and 12.x allows remote attackers to cause a denial of service by sending the ENVIRON option to the Telnet daemon before it is ready to accept it, which causes the system to reboot.

When was CVE-2000-0268 disclosed?

CVE-2000-0268 was first published in the National Vulnerability Database on April 20, 2000, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2000-0268 actively exploited?

CVE-2000-0268 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 73.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-2000-0268?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2000-0268, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2000-0268

Explore →

Is Your Infrastructure Affected by CVE-2000-0268?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2000-0268

📅 Published

🔄 Last Modified

🔗 References (6)